In due course of time, various types of diseases are manifest in those who are sinful. Similarly, in this world there are many deceptive friends in false garbs, but eventually, because of their false behavior, their actual enmity becomes manifest.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
सन्ति ह्यसाधवो लोके दुर्मैत्राश्छद्मवेषिणः । तेषामुदेत्यघं काले रोगः पातकिनामिव
santi hyasādhavo loke durmaitrāśchadmaveṣiṇaḥ | teṣāmudetyaghaṃ kāle rogaḥ pātakināmiva
SB 7.5.27